stainless steel. It refers to corrosion in the atmosphere and weak corrosive media steel. Corrosion rate of less than 0.01mm / year, that is "completely corrosion"; corrosion rate of less than 0.1mm / year, that is "corrosion". China's stainless steel model is the use of element symbols plus numbers, such as 1Cr18Ni9,0Cr18Ni9, 00Cr18Ni9,1Cr17,3Cr13,1Cr17Mn6Ni5N, etc., the number that the corresponding element content. Common stainless steel models commonly used in digital symbols, there are 200 series, 300 series, 400 series, they are

American representation, such as 201,202,302,303,304,316,410,420,430, etc., the American Institute of Iron and Steel is to use three digits to mark a variety of standard grade forged stainless steel. Among them: ① austenitic stainless steel with 200 and 300 series of numbers marked, ② ferrite and martensitic stainless steel with 400 series figures. For example, some of the more common austenitic stainless steel is marked with 201, 304, 316 and 310, ③ ferritic stainless steel is marked with 430 and 446, martensitic stainless steel is 410,420 and 440C as a mark, Biphase (austenite - ferrite), ④ stainless steel, precipitation hardened stainless steel and iron content of less than 50% of the high alloy is usually named after the patent name or trademark. 2. Functional differences: 304 is a versatile widely used stainless

Steel material, which is widely used in the production of equipment and mechanical parts that require good overall performance (corrosion resistance and moldability). In the building can withstand the general corrosion, resistance to food processing medium erosion (but contains concentrated acid and chloride components of the high temperature state may be corrosion), can resist organic compounds, dyes and a wide range of various inorganic compounds. 304L type (low carbon), resistant to nitric acid, and durable medium temperature and concentration of sulfuric acid, widely used as liquid gas storage tank for low temperature equipment (304N), other consumer products, kitchen equipment, hospital equipment, Tools, waste water treatment devices. Type 430 is lower than the 304 type alloy and is used for high polishing in a mild atmosphere

Decorative purposes, can also be used as nitric acid and food processing equipment. Stainless steel 201 and 304 difference 1, specifications: commonly used stainless steel sheet is divided into 201 and 304 two models, the actual composition is different, 304 quality better, but the price is expensive, 201 worse. 304 for the import of stainless steel, 201 for the domestic stainless steel plate. 2, 201 composition of 17Cr-4.5Ni-6Mn-N, is the section of Ni steel, 301 steel alternative steel. After cold processing with magnetic, for railway vehicles. 3, 304 composition of 18Cr-9Ni, is the most widely used stainless steel, heat-resistant steel. Used for

Food production equipment, the former chemical equipment, nuclear energy and so on. 4, 201 is a high manganese content, the surface is very bright with dark black, high manganese content is easy to rust. 304 more chromium, the surface showing matte, no rust. There is a comparison between the two. The most important thing is the corrosion resistance of different, 201 corrosion resistance is poor, so the price will be much cheaper. And because 201 low nickel, so the price is lower than the 304, so the corrosion resistance is not as good as the 304. 5, 201 and 304 is the difference between the nickel-containing problem. And the price of 304 are now more expensive, generally close to 50000 a ton, but at least 304 can guarantee that the use of the process will not rust. (Can be used to do the experiment)